Effects of breast feeding on BMI growth trajectories in rural western China: A birth cohort study

Jing Zhou; Lingxia Zeng; Baibing MI; Yijun Kang; Li Wang; Ye Wang; Hong Yan; Yanfeng Xiao

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Effects of breast feeding on BMI growth trajectories in rural western China: A birth cohort study

VernacularTitle:母乳喂养对中国西部农村地区婴幼儿BMI生长轨迹影响的出生队列研究
Author: Jing ZHOU ¹ ; Lingxia ZENG ² ; Baibing MI ² ; Yijun KANG ² ; Li WANG ¹ ; Ye WANG ³ ; Hong YAN ² ; Yanfeng XIAO ¹
Author Information

1. Department of Pediatrics, The Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an 710004
2. Department of Epidemiology and Biostatistics, School of Public Health of Xi’an Jiaotong University Health Science Center, Xi’an 710061
3. Department of Traditional Chinese Medicine, The Second Affiliated Hospital of Xi’an Jiaotong University, Xi’an 710004, China
Publication Type:Journal Article
Keywords: BMI growth trajectory; breast feeding; infant; birth cohort study
From: Journal of Xi'an Jiaotong University(Medical Sciences) 2021;42(2):317-322
CountryChina
Language:Chinese
Abstract: 【Objective】 To describe the BMI growth trajectories from birth to 24 months and examine the effects of fully breastfeeding time and breastfeeding duration on the BMI growth trajectories. 【Methods】 We conducted a follow-up study of a cohort of 1 388 eligible births. Height and weight were measured at birth, every 3 months to 12 months, and every 6 months to 24 months. Detailed demographic, feeding, activity and diseases data were also collected prospectively. Latent growth mixture modeling was conducted to model the BMI growth trajectories from birth to 24 months. Mixed-effects logistic regression analyses were made to examine the impacts of breastfeeding on this outcome. 【Results】 We identified six BMI trajectory patterns in the 1 285 infants analyzed and labeled them as follows: "normative growth" (26.6%), "normal-accelerating growth" (8.7%), "normal-decelerating growth" (11.7%), "lower-persistent growth" (6.6%), "rapid growth" (26.8%), and "rapid-accelerating growth" (19.5%). Mixed-effects logistic regression analyses revealed that fully breastfeeding ≥ 3 months could significantly decrease the risk of "rapid growth" (OR=0.71, 95% CI 0.51-0.98) and "rapid-accelerating growth" (OR=0.53, 95% CI 0.37-0.75). After adjustment for confounding factors, the relationship remained significant (OR=0.61, 95% CI 0.41-0.89; OR=0.46, 95% CI 0.31-0.68). Weaning before 6 months could significantly increase the risk of "rapid growth" (OR=1.76, 95% CI 1.19-2.61) and "rapid-accelerating growth" (OR=2.08, 95% CI 1.38-3.14). These associations persisted after adjustment for confounding factors (OR=1.69, 95% CI 1.08-2.71; OR=1.88, 95% CI 1.18-2.99). 【Conclusion】 In rural Western China, the main BMI growth trajectory patterns include "normative growth" , "rapid growth" , and "rapid-accelerating growth" . Prolonging breastfeeding may reduce excess weight gain during infancy.